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Property, Plant and Equipment (Details)
$ in Millions
6 Months Ended
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Asset Retirement Obligations (ARO)    
Beginning Balance $ 2,418.9 [1],[2],[3],[4]  
Accretion Expense 50.8 [1],[2],[3],[4]  
Liabilities Incurred 0.2 [1],[2],[3],[4]  
Liabilities Settled (129.9) [1],[2],[3],[4]  
Asset Retirement Obligation, Revision of Estimate 204.3 [1],[2],[3],[4]  
Ending Balance 2,544.3 [1],[2],[3],[4]  
AEP Texas Inc. [Member]    
Asset Retirement Obligations (ARO)    
Beginning Balance 29.1 [2],[3]  
Accretion Expense 0.6 [2],[3]  
Liabilities Incurred 0.0 [2],[3]  
Liabilities Settled 0.0 [2],[3]  
Asset Retirement Obligation, Revision of Estimate (16.8) [2],[3]  
Ending Balance 12.9 [2],[3]  
Appalachian Power Co [Member]    
Asset Retirement Obligations (ARO)    
Beginning Balance 111.1 [2],[3]  
Accretion Expense 2.8 [2],[3]  
Liabilities Incurred 0.0 [2],[3]  
Liabilities Settled (2.7) [2],[3]  
Asset Retirement Obligation, Revision of Estimate 199.8 [2],[3]  
Ending Balance 311.0 [2],[3]  
Indiana Michigan Power Co [Member]    
Property, Plant and Equipment (Textuals)    
Asset Retirement Obligations (ARO) Liability for Nuclear Decommissioning of the Cook Plant 1,760.0 $ 1,730.0
Public Service Co Of Oklahoma [Member]    
Asset Retirement Obligations (ARO)    
Beginning Balance 52.2 [2],[3]  
Accretion Expense 1.5 [2],[3]  
Liabilities Incurred 0.0 [2],[3]  
Liabilities Settled 0.0 [2],[3]  
Asset Retirement Obligation, Revision of Estimate (4.8) [2],[3]  
Ending Balance 48.9 [2],[3]  
Southwestern Electric Power Co [Member]    
Asset Retirement Obligations (ARO)    
Beginning Balance 212.2 [1],[2],[3]  
Accretion Expense 5.4 [1],[2],[3]  
Liabilities Incurred 0.0 [1],[2],[3]  
Liabilities Settled (2.1) [1],[2],[3]  
Asset Retirement Obligation, Revision of Estimate 24.0 [1],[2],[3]  
Ending Balance 239.5 [1],[2],[3]  
Oklaunion Generating Station [Member] | AEP Texas Inc. [Member]    
Asset Retirement Obligations (ARO)    
Asset Retirement Obligation, Revision of Estimate (17.0)  
Oklaunion Generating Station [Member] | Public Service Co Of Oklahoma [Member]    
Asset Retirement Obligations (ARO)    
Asset Retirement Obligation, Revision of Estimate (5.0)  
Dolet Hills Power Station [Member] | Southwestern Electric Power Co [Member]    
Asset Retirement Obligations (ARO)    
Asset Retirement Obligation, Revision of Estimate 21.0  
Conesville Generating Station [Member]    
Asset Retirement Obligations (ARO)    
Liabilities Settled (106.0)  
Glen Lyn Station [Member] | Appalachian Power Co [Member]    
Asset Retirement Obligations (ARO)    
Asset Retirement Obligation, Revision of Estimate $ 199.0  
[1] Includes ARO related to Sabine and DHLC.
[2] Includes ARO related to asbestos removal.
[3] Includes ARO related to ash disposal facilities.
[4] Includes ARO related to nuclear decommissioning costs for the Cook Plant of $1.76 billion and $1.73 billion as of June 30, 2020 and December 31, 2019, respectively.